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I just found out that FA cases from early 1957 were over annealed and are not safe to re-load.
I have 100 fired 1961 FA cases and they show signs of too heavy a load. The load is not over max safe loads and caused no problem before. Now I experience bolt hard to lift and cases hard to pull out of the chamber. Tried a lighter load and same thing.
Could the 1961 cases have the same problem, too few drawing steps hence over annealing of the case head?
Anyone have this problem?
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Military brass is usually heavier, sometimes quite a bit heavier, than commercial brass, which translates to a smaller case volume. For this reason you very often have to reduce powder charges by as much as 10% from what is OK in a commercial case. There is probably nothing at all wrong with the FA brass you are using, just that it's probably heavier.
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The 1957 FA Match cases were made by the "two draw" process (whatever that was) and were not recommended for reloading but I've not heard the same thing said about any other brass from that period. Shooters have always used FA for reloading and/or making wildcats so it seems that FA's suggestion about not reloading them was not followed.
I think fivering has come up with the correct answer. The brass is probably a lot heavier than you are used to (maybe that's what "two draw" meant) and you have to adjust your loads accordingly. Weigh some different empty cases to compare capacity. That may or may not give you the answer you're after.